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        <p>This page references vocabularies that are widely used, and that are likely to cover some aspects of your app:</p>
<ul>
  <li><a href="#common">Common vocabularies</a> are all-purpose vocabularies solving everyday life issues (for app development)</li>
  <li><a href="#technical">Technical vocabularies</a> are vocabularies describing technical entities: HTTP messages, RSS feeds…</li>
  <li><a href="#core">Core vocabularies</a> are vocabularies used to build vocabularies.</li>
  <li><a href="#solid">Solid vocabularies</a> are vocabularies present in the Solid standard.</li>
</ul>

<h1 id="-vocabularies-solving-common-issues"><a id="common"></a> Vocabularies solving common issues</h1>

<p>These vocabularies have a general community support, and they address issues that are horizontal to many applications.</p>

<table>
  <thead>
    <tr>
      <th>Frequently Asked Questions</th>
      <th>Relevant vocabularies</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>I want to talk about social interaction</td>
      <td><a href="/for-developers/apps/vocabularies/well-known/common#as">as</a></td>
    </tr>
    <tr>
      <td>I want to talk about licenses</td>
      <td><a href="/for-developers/apps/vocabularies/well-known/common#cc">cc</a></td>
    </tr>
    <tr>
      <td>I want to talk about documents’ metadata (author, title, etc.)</td>
      <td><a href="/for-developers/apps/vocabularies/well-known/common#dc">dc elements and terms</a></td>
    </tr>
    <tr>
      <td>I want to talk about events</td>
      <td><a href="/for-developers/apps/vocabularies/well-known/common#levt">levt</a>, <a href="/for-developers/apps/vocabularies/well-known/common#ical">ical</a></td>
    </tr>
    <tr>
      <td>I want to talk about people, communities and organizations</td>
      <td><a href="/for-developers/apps/vocabularies/well-known/common#foaf">foaf</a>, <a href="/for-developers/apps/vocabularies/well-known/common#vc">vcard</a>, <a href="/for-developers/apps/vocabularies/well-known/common#sioc">sioc</a></td>
    </tr>
    <tr>
      <td>I want to talk about places</td>
      <td><a href="/for-developers/apps/vocabularies/well-known/common#geonames">geonames</a>, <a href="/for-developers/apps/vocabularies/well-known/common#geonames">wgs84</a></td>
    </tr>
    <tr>
      <td>I want to describe an online meeting</td>
      <td><a href="/for-developers/apps/vocabularies/well-known/common#meeting">meeting</a></td>
    </tr>
    <tr>
      <td>I want to talk about music</td>
      <td><a href="/for-developers/apps/vocabularies/well-known/common#mo">mo</a></td>
    </tr>
    <tr>
      <td>I want to describe things that are usually found on web pages</td>
      <td><a href="/for-developers/apps/vocabularies/well-known/common#schema">schema</a></td>
    </tr>
    <tr>
      <td>I want to talk about time and timezones</td>
      <td><a href="/for-developers/apps/vocabularies/well-known/common#time">time</a>, <a href="/for-developers/apps/vocabularies/well-known/common#tzont">tzont</a></td>
    </tr>
    <tr>
      <td>I want to track issues and log events</td>
      <td><a href="/for-developers/apps/vocabularies/well-known/common#rlog">rlog</a>, <a href="/for-developers/apps/vocabularies/well-known/common#wf">wf</a></td>
    </tr>
  </tbody>
</table>

<h1 id="-vocabularies-describing-technical-elements"><a id="technical"></a> Vocabularies describing technical elements</h1>

<p>These vocabularies are tied to technical standard.</p>

<table>
  <thead>
    <tr>
      <th>Described element</th>
      <th>Vocabulary</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>X509 Certificates</td>
      <td><a href="/for-developers/apps/vocabularies/well-known/technical#cert">cert</a></td>
    </tr>
    <tr>
      <td>HTTP messages</td>
      <td><a href="/for-developers/apps/vocabularies/well-known/technical#http">http</a></td>
    </tr>
    <tr>
      <td>HTTP headers</td>
      <td><a href="/for-developers/apps/vocabularies/well-known/technical#httph">httph</a></td>
    </tr>
    <tr>
      <td>Linked Data Platform</td>
      <td><a href="/for-developers/apps/vocabularies/well-known/technical">ldp</a></td>
    </tr>
    <tr>
      <td>RSS feeds</td>
      <td><a href="/for-developers/apps/vocabularies/well-known/technical">rss</a></td>
    </tr>
    <tr>
      <td>XML Schema</td>
      <td><a href="/for-developers/apps/vocabularies/well-known/technical#xsd">xsd</a></td>
    </tr>
  </tbody>
</table>

<h1 id="-core-vocabularies"><a id="core"></a> Core vocabularies</h1>

<p>These vocabularies are used as building blocks to make the others.</p>

<ul>
  <li><a href="/for-developers/apps/vocabularies/well-known/core#rdf">Resource Description Framework (rdf)</a></li>
  <li><a href="/for-developers/apps/vocabularies/well-known/core#rdfs">RDF Schema (rdfs)</a></li>
  <li><a href="/for-developers/apps/vocabularies/well-known/core#owl">Web Ontology Language (owl)</a></li>
</ul>

<h1 id="-vocabularies-essential-to-solid"><a id="solid"></a> Vocabularies essential to Solid</h1>

<p>These vocabularies are the ones featured in the Solid standard.</p>

<ul>
  <li><a href="/for-developers/apps/vocabularies/well-known/solid#acl">Access Control List (acl)</a></li>
  <li><a href="/for-developers/apps/vocabularies/well-known/technical">Linked Data Platform (ldp)</a></li>
  <li><a href="/for-developers/apps/vocabularies/well-known/technical#mime">Media types (mime)</a></li>
  <li><a href="/for-developers/apps/vocabularies/well-known/solid#terms">Solid terms</a></li>
  <li><a href="/for-developers/apps/vocabularies/well-known/solid#space">Workspace</a></li>
  <li><a href="/for-developers/apps/vocabularies/well-known/solid#posix">POSIX stat</a></li>
  <li><a href="/for-developers/apps/vocabularies/well-known/solid#ui">User Interface (ui)</a></li>
</ul>

<p>Your application requires a vocabulary that you did not find on this page? Maybe it’s out there somewhere. Next, we see how to <a href="/for-developers/apps/vocabularies/discover">discover vocabularies</a>.</p>

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